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551A, 551B, 558F, 559F
COMMERCIAL
Pac
Dura and
SINGLE PACKAGE ROOFTOP
Pac
Dura Plus Series
ELECTRIC COOLING UNITS
Sizes 036-300
3 to 25 Tons
551B036-072
558F036-073
551B090-150
558F090-150
551A155,180
558F180-210
559F180-216
558F300
558F240
559F240-300
FEATURES/BENEFITS Each unit contains a factory printout indicating tested
pressures, amperages, dates, and inspectors, providing certifi-
• Efficient cooling using hermetic compressors.
cation of the unit’s status at the time of manufacture.
Fu
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from vertical to horizontal applica- 4. Filter driers, which trap moisture and debris in the refrigera- Units are Easily Converted tions to make retrofit and add-on jobs easier. To convert tion system. from vertical to horizontal discharge, simply relocate 2 panels 5. A fixed orifice metering system precisely controls refrigerant (036-150). flow (sizes 036-150), preventing slugging and floodback, The same basic unit can be used for a variety of applications while maintaining optimum unit perfor
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on all dis- permit easy tracing and diagnostics. Easily Accessible Refrigerant Access Ports Color-Coded Wires charge, suction, and liquid lines permit easy and accurate Indoor Fan Motors are accessible through a single access measurements. door to facilitate servicing and adjusting after installation. Resettable 24-V Circuit Breaker (Sizes 090-150) allows room Compressors and Safety Switches are Easily Accessible for for error without replacing transformers or fuses. troubleshooting and system
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OPTIONS AND ACCESSORIES ITEM OPTION* ACCESSORY† 100% Open Two-Position Damper (036-150) X 25% Open Two-Position Damper (036-150) X Barometric Relief Damper (150-300) X (Not for use with horizontal roof curb) Condenser Coil Grille (036-150) X Condenser Coil Hail Guard Assembly (036-300) X Convenience Outlet X Copper Fins Indoor and Outdoor Coil X Copper Fins Outdoor Coil X Double Wall in Unit Airstream (155-300) X Durablade Integrated Economizer (036-150) X E-Coat Outdoor Coil (Aluminum) X EconoM
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OPTIONS AND ACCESSORIES (cont) LOW AMBIENT CONTROLS Standard units are designed to operate in cooling at outdoor temperatures down to 25 F for size 036-150 units, 40 F for size 150-300 units. With accessory Motormaster® control (condenser-fan cycling) units can operate at outdoor temperatures down to –20 F. The head pressure controls, which mount in the condenser section, control the condenser-fan motor to maintain correct condensing temperature. MOTORMASTER II CONTROL (CONDENSER FAN CYCLING) MO
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OPTIONS AND ACCESSORIES (cont) DURA-SHIELD CONDENSER COIL OPTIONS Condenser coil options are available to match coil construction to site conditions for the best corrosion durability. Pre-coated coils provide pro- tections in mild coastal environments. All copper coils are best suited for moderate coastal applications, while E-coated coils provide superior protection in severe coastal and industrial applications. CONDENSER COIL PROTECTION APPLICATIONS ENVIRONMENT DESCRIPTION Standard, Mild Moder
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OPTIONS AND ACCESSORIES (cont) LIGHT COMMERCIAL THERMIDISTAT BRYANT COMMERCIAL THERMOSTAT Field-installed, wall-mounted device combines temperature and humidity control in one device. The dehumidifier output is used to control the Perfect Humidity dehumidification package. The occu- pied space humidity has a set point range between 50% and 90% relative humidity and provides constant fan operation in occupied mode. TIME GUARD® CONTROL Time Guard II Control automatically prevents compressor from D
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OPTIONS AND ACCESSORIES (cont) UNIT-MOUNTED DISCONNECT (Sizes 036-150) UNIT-MOUNTED DISCONNECT (Sizes 150-300) Factory-installed, internally-mounted, NEC (National Electri- cal Code) and UL (Underwriters’ Laboratories) approved non-fused switch provides unit power shutoff with disconnect lockout protection capability. The switch is accessible from outside the unit. CONVENIENCE OUTLET Factory-installed, internally mounted and externally accessible 115-v female receptacle. Includes 15-amp GFI (Gro
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OPTIONS AND ACCESSORIES (cont) HAIL GUARD COIL GUARD GRILLE (036-150 Only) Condenser coil hail guard accessory (field installed) protects coils Coil guard grille protects coils against large objects and against damage from hail and other flying debris. vandalism. CONTROL BOX HINGED PANEL OPTION*, CONTROL BOX HINGED PANEL OPTION*, 581B036-072 UNITS 581B090-150 UNITS SHOWN COMPRESSOR HINGED PANEL OPTION*, COMPRESSOR HINGED PANEL OPTION*, 581B090-150 UNITS SHOWN 581B036-072 UNITS SHOWN *Hinged acc
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OPTIONS AND ACCESSORIES (cont) EVAPORATOR-FAN HINGED PANEL OPTION* FILTER HINGED PANEL OPTION* 581B036-072 This is included as a factory-installed option. It per- mits quick and simple evaporator-fan access. This is included as a factory-installed option. It permits tool-less filter access. *Hinged panels not available on 580F models. LP CONVERSION KIT BURNER SPUDS (ORIFICES) LP conversion kit allows the unit to utilize a liquid propane fuel supply in areas where natural gas is not available. (
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CONTROLS OPERATING SEQUENCE — SIZE 036-073 UNITS OPERATING SEQUENCE — SIZE 090-150 UNITS Cooling, Units Without Economizer — When the thermostat Cooling, Units Without Economizer — When the thermostat calls for cooling, terminals G and Y1 are energized. The indoor calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), and compressor contactor (evaporator) fan contactor (IFC), compressor contactor no. 1 no. 1 (C1) are energized and the indoor (evaporator
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CONTROLS (cont) Heating, Units Without Economizer — Upon a call for heating compressor no. 1 continues to operate. If Y2 remains through terminal W1, indoor (evaporator) fan contactor (IFC) energized for more than 20 minutes, compressor no. 2 is and heater contactor no. 1 (HC1) are energized. On units energized. equipped for 2 stages of heat, when additional heat is needed, NOTE: Compressor no. 2 cannot be energized unless there is a HC2 is energized through W2. signal for Y2 from the space ther
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CONTROLS (cont) As the refrigerant leaves the evaporator, the refrigerant passes When the thermidistat is satisfied, the relay internal switch a subcooler control low-pressure switch (S-LPS1 for circuit 1 or opens, cutting power to and deenergizing the LLSVs. The S-LPS2 for circuit 2) in the suction line. This low-pressure refrigerant is routed back through the evaporators and the switch will deactivate the Perfect Humidity™ package when the subcooler coils are removed from the refrigerant loops
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TYPICAL WIRING SCHEMATIC (Single Fan Units, Sizes 036-073) 14
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TYPICAL WIRING SCHEMATIC (Two-Fan Units, Size 090-150) 50DK508234 24VAC RED OAT TAN OAT 24COM BRN ACTUATOR COM VIO RED GND 50DK509044 GRN 1 OAH WHT CL01 GRY BLU +15V RED 2 CL02 ORN RAT TAN BLK VIO 3 COM VIO WHT BRN RED 4 RAM WHT GRY +15V RED 5 VIO RAT 6 CO2 + PNK CO2 (COM) 7 DAT VIO YEL B1 8 COM PNK ORN BLU Y1 9 REM POT Y2 YEL COM 10 G BLK LED 11 AO COM FIELD INSTALLED COM 12 OPTION PL6 12-PIN WHT/YEL FEMALE BLK/YEL 12 8 4 11 7 3 WHT/GRY 1 10 6 2 3-PIN BLK/GRY 2 MOLEX 9 5 1 BRN 3 NOT USED MOLEX
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TYPICAL WIRING SCHEMATIC (Sizes 155-300) 16
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TYPICAL WIRING SCHEMATIC (Sizes 155-300) LEGEND Switch AHA — Adjustable Heat Anticipator FSS — Filter Status Switch SW — TB — Terminal Block AWG — American Wire Gage FU — Fuse TC — Thermostat Cooling BRK W/AT — Breaks with Amp Turns GND — Ground Thermostat Heating C— Contactor, Compressor HC — Heater Contactor TH — TRAN — Transformer CAP — Capacitor HPS — High-Pressure Switch CB — Circuit Breaker HTR — Heater Terminal (Marked) CC — Cooling Compensator IFC — Indoor-Fan Contactor CH — Crankcase He
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TYPICAL WIRING SCHEMATIC (cont) LEGEND OAT — Outdoor-Air Thermostat EconoMi$er Wiring NOTES: 1. If the Non-Fused Disconnect Option is ordered, the Non-Fused Disconnect will be factory-installed. 2. The Disconnect takes the place of TB-1 as shown on the unit wiring diagram label and the component arrangement label. Non-Fused Disconnect (Optional) 18
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TYPICAL PIPING AND WIRING — SIZES 036-150 Vertical Discharge Ducting LEGEND NEC — National Electrical Code *Factory-supplied, internally mounted disconnect available as an option. Horizontal Discharge Ducting 19
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TYPICAL PIPING AND WIRING — SIZES 155-300 LEGEND NEC — National Electrical Code NOTES: 1. Illustration shown is a general guide only and is not intended to include all details for any specific installation. 2. Installation must comply with all applicable codes. 3. A 90-degree elbow must be installed on the supply duct connection for units equipped with electric heat. 20
